from datetime import datetime

from django import http
from django.contrib.auth.mixins import LoginRequiredMixin
from django.shortcuts import render
from django.views import View

from apps.contents.utils import get_categories
from apps.goods.models import GoodsCategory, SKU, GoodsVisitCount
from apps.goods.utils import get_breadcrumb
from utils.response_code import RETCODE


# 记录访问量
class DetailVisitView(View):
    def post(self, request, category_id):
        # 1.接收 校验参数
        try:
            category = GoodsCategory.objects.get(id=category_id)
        except Exception as e:
            return http.HttpResponseBadRequest('商品不存在!')

        # 2.日期格式化的原因: datetime.now() 英文 时分秒;  年月日
        date_str = datetime.now().strftime('%Y-%m-%d')
        date_today = datetime.strptime(date_str, '%Y-%m-%d')

        # 3.带着日期 category_id 去查询当天 有没有访问记录
        try:
            # goods_visit = GoodsVisitCount.objects.get(category=category, date=date_today)
            goods_visit = category.goodsvisitcount_set.get(date=date_today)

        except Exception as e:
            # 4. 如果没有 新建一条记录
            goods_visit = GoodsVisitCount()



        # 5. count += 1 save()
        goods_visit.count += 1
        goods_visit.category = category
        goods_visit.save()

        # 6. 返回结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK'})

# 3.详情页 detail/(?P<sku_id>\d+)/
class DetailView(View):
    def get(self, request, sku_id):

        """提供商品详情页"""
        # 获取当前sku的信息
        try:
            sku = SKU.objects.get(id=sku_id)
        except SKU.DoesNotExist:
            return render(request, '404.html')

        # 查询商品频道分类
        categories = get_categories()
        # 查询面包屑导航
        breadcrumb = get_breadcrumb(sku.category_id)

        # 构建当前商品的规格键
        sku_specs = sku.specs.order_by('spec_id')
        sku_key = []
        for spec in sku_specs:
            sku_key.append(spec.option.id)
        # 获取当前商品的所有SKU
        skus = sku.spu.sku_set.all()
        # 构建不同规格参数（选项）的sku字典
        spec_sku_map = {}
        for s in skus:
            # 获取sku的规格参数
            s_specs = s.specs.order_by('spec_id')
            # 用于形成规格参数-sku字典的键
            key = []
            for spec in s_specs:
                key.append(spec.option.id)
            # 向规格参数-sku字典添加记录
            spec_sku_map[tuple(key)] = s.id
        # 获取当前商品的规格信息
        goods_specs = sku.spu.specs.order_by('id')
        # 若当前sku的规格信息不完整，则不再继续
        if len(sku_key) < len(goods_specs):
            return
        for index, spec in enumerate(goods_specs):
            # 复制当前sku的规格键
            key = sku_key[:]
            # 该规格的选项
            spec_options = spec.options.all()
            for option in spec_options:
                # 在规格参数sku字典中查找符合当前规格的sku
                key[index] = option.id
                option.sku_id = spec_sku_map.get(tuple(key))
            spec.spec_options = spec_options

        # 渲染页面
        context = {
            'categories': categories,
            'breadcrumb': breadcrumb,
            'sku': sku,
            'specs': goods_specs,
        }
        return render(request, 'detail.html', context)


class HotView(View):
    def get(self,request,category_id):
        # 5. 热销排行

        # 1.获取-sales 前两个
        skus = SKU.objects.filter(is_launched=True).order_by('-sales')[:2]

        # 2.构建前端需要的数据格式
        hot_skus = []
        for sku in skus:
            hot_skus.append({
                'id':sku.id,
                'default_image_url':sku.default_image.url,
                'name':sku.name,
                'price':sku.price
            })

        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'hot_skus': hot_skus})

class ListView(View):
    def get(self, request, category_id, page_num):
        # 1. 三级商品分类
        categories = get_categories()

        # 2. 面包屑组件
        category = GoodsCategory.objects.get(id=category_id)
        breadcrumb = get_breadcrumb(category_id)

        # 3. 列表数据 排序
        #  default price hot
        sort = request.GET.get('sort')

        if sort == "hot":
            sort_field = "-sales"
        elif sort == "price":
            sort_field = "price"
        else:
            sort_field = "create_time"

        skus = SKU.objects.filter(category_id,is_launched=True).order_by(sort_field)

        # 4. 分页
        # 4.1 每页显示 几个 3,4,5
        from django.core.paginator import Paginator
        paginator = Paginator(skus, 5)

        # 4.2 总页数
        total_page = paginator.num_pages

        # 4.3 当前页的商品
        page_skus = paginator.page(page_num)


        context = {
            'categories': categories,
            'breadcrumb': breadcrumb,
            'sort': sort,  # 排序字段
            'category': category,  # 第三级分类
            'page_skus': page_skus,  # 分页后数据
            'total_page': total_page,  # 总页数
            'page_num': page_num,  # 当前页码
        }
        return render(request, 'list.html', context)
